The phone rings hectically late at night, the first to answer a groggy Ash. Nurse Joy pops on, shouting, "I did it!! I found a cure!! ...Well, not a perfect cure, but in lab tests my serum eliminated 95% of the pervasive thunder stone and restored the original human genome. I'm sending over my Chansey through with the antidote now. Should we tell the patient?" As the Chansey pops out of the pokeball in the machine basin, holding a dart gun, Ash piques his eyelid as he suddenly hears high-pitched Pikachu cries from the neighboring room. He runs over to see Pikachu pounding away at Mist again, and Misty seemingly goading Pikachu on. "Really, Misty?! I come in here to tell you we have a way of turning you human again and you're letting my Pikachu mount you again?!" Ash reaches over to seperate them, when, of all things, Misty tries to shock Ash. "Pi- Pika..." She growls, deep in her rut. "She's so lost in estrus she doesn't understand me right now... Chansey, shoot her with the antidote!!"
Chansey fires the dart, nailing Misty square in the bum, but she is so lost in bliss she doesn't mind the dart. After a minute of furious pumping, Pikachu starts to notice his mate getting bigger. Misty fails to notice as well that her fur as rapidly shedding as her human hair quickly grows back at exponential speed. Pikachu, undaunted, continues mating with her as her ass swells to a ripe feminine proportion. As her legs lengthen, she finds her original position uncomfortable and flips over, having Pikachu mate her in the missionary position, her now D-cup breasts in view. Ash blinks oddly, both with embarrassment and confusion, stating, "That's not right. Her chest was never THAT big... and her hair that long... Something's off." As Misty's hips narrow, her hair has already grown down to her tail, which strangely shows no signs of going away. As Misty's face crunches back dwn into her old human face, her cries change from Pikachu cries of pleasure to human moans of pleasure. "More!! MORE!! Must make more babies, Pikachu!! Harder!!" Soon, they climaxed, and Ash fainted from embarrassment.
Shortly thereafter, Ash awoke, water splashed on him. Standing over him was Misty, but not quite. While her face and hair color were the same, she had a tighter waist, wider hips, and much larger chest than she used to, and most noticeably, she still had long Pikachu ears on her head, and a long Pikachu tail practically dragging the floor. "Get up, Ash..." She brushed off some remaining shed fur from her shoulder, then reached down to help Ash up. As he was being pulled up, he couldn't help both notice she was still dripping from her loins. "I see you cured me... kinda..." She looks back, flicking her tail. Ash nodded, red as a beet. Misty says, "Even though I still feel like I'm in heat, I think it's subsiding. I think it's partly due to the cure, and partly..." She rubs her belly, "...due to this bun in the oven... Why do you keep acting like that?!"
Ash screams out what he is thinking. "Get some clothes on!! You're indecent!!"
Hours later, at breakfast, Misty comes down, dressed in a bikini top, a pair of her suspenders, and a green version of Dawn's pink miniskirt,, the rear hoisted up by her tail. "I know this outfit is out of character for me," she said to Ash and Brock, "but I had to have all my clothes sent to a tailor to accommodate my new physique... and my tail, and this is all that'll fit me here right now. I always told dawn 'I hate skirts,' but strangely I'm glad she gave me this one, otherwise I'd just be walking about in my underwear while I have have my clothes altered." Brock goes into cardiac arrest. Ash says, "Well, while the tailor mends your clothes, we can run some more tests on you..."
What is next...?